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$205 Million Convertible Note Offering - Additional Information (Detail) (USD $) | 9 Months Ended
--- | ---
Feb. 28, 2014 | Feb. 28, 2013
Debt Instrument [Line Items] |  |
Proceeds from not issuance, net | $ 262,211,000 | $ 318,994,000
Convertible Notes |  |
Debt Instrument [Line Items] |  |
Issuance of note | 205,000,000 |
Interest rate on notes issue | 2.25% |
Notes maturity date | Dec. 15, 2020 |
Note Interest payment frequency, term | Interest at a fixed rate of 2.25% on the Convertible Notes semi-annually in arrears on June 15thand December 15thof each year, beginning on June 15, 2014 |
Proceeds from not issuance, net | 200,100,000 |
Straight debt rate | 3.92% |
Debt instrument, conversion rate | 18.8905 |
Convertible notes, initial conversion price per share | $ 52.94 |
Unamortized debt discount | 20,100,000 |
Notes redemption date | Dec. 20, 2017 |
Number of trading days | 30 days |
Principal amount of the notes to be repurchased, plus accrued and unpaid interest | 100.00% |
Convertible Notes | Minimum |  |
Debt Instrument [Line Items] |  |
Percentage of sales price of common stock exceeding conversion price | 125.00% |
Number of trading days for which a conversion price is in effect during any 30 consecutive trading day period | 20 days |
Convertible Notes | Liability Component |  |
Debt Instrument [Line Items] |  |
Issuance of note | 184,300,000 |
Convertible Notes | Equity Component |  |
Debt Instrument [Line Items] |  |
Issuance of note | 20,700,000 |
Unsecured Senior Notes 6.25% December 15, 2013 |  |
Debt Instrument [Line Items] |  |
Notes maturity date | Dec. 15, 2013 |
Principal amount of unsecured senior notes, repayments | $ 200,000,000 |
Unsecured senior notes , interest rate | 6.25% |

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